JP2023057802A - Cleaning agent composition, and cleaning method - Google Patents

Abstract

To provide a cleaning agent composition excellent in the capability of removing a (meth)acrylic resin and dust present on an article.SOLUTION: The cleaning agent composition comprises 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoro ethylether and 2-chloro-1,1,1-trifluoroethane.SELECTED DRAWING: None

Description

The present invention relates to cleaning compositions and cleaning methods.

Hydrofluoroether (hereinafter also referred to as HFE) is known to be a solvent that does not have a chlorine atom in its molecule and does not affect the ozone layer. HFE is used as a cleaning agent, a diluent for lubricating oil, etc., and a heat transfer medium due to its excellent drying property as a fluorine-based solvent. US Pat. No. 5,300,000 discloses that articles to be cleaned are treated with low molecular weight fluorinated ethers having boiling points in the range of 20-120° C. and having at least 3 carbon atoms and one or more hydrogen atoms. Disclosed is a method of solvent cleaning an article comprising contacting the article with a solvent composition comprising either or vapor thereof or both.

Patent No. 2961924

Cleaning removes various contaminants from the article. Contaminants include resin materials, dust, adhesives, inks, inorganic components, and organic components, and these contaminants also exist as a composite contaminant of two or more types on the substrate.

However, for stains containing (meth)acrylic resin and dust originating from adhesives and inks, the (meth)acrylic resin and dust are integrated, so there are cases where the method described in Patent Document 1 cannot be used to clean the stain. was there.

An object of the present invention is to provide a detergent composition that is excellent in removing (meth)acrylic resin and dust from articles.
Another object of the present invention is to provide a cleaning method.

As a result of intensive studies, the inventors of the present invention have found that the following configuration can solve the problem.
[1] A cleaning composition containing 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and 2-chloro-1,1,1-trifluoroethane.
[2] The total content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and the 2-chloro-1,1,1-trifluoroethane is The detergent composition according to [1], which is 80 to 100% by mass relative to the total amount of the detergent composition.
[3] [1] or [2], further comprising at least one selected from the group consisting of tetrafluoroethylene and 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene ] The detergent composition according to .
[4] The cleaning composition according to any one of [1] to [3], which is used for cleaning articles to which a (meth)acrylic resin and dirt including dust adhere.
[5] A cleaning method comprising cleaning a (meth)acrylic resin and an article to which dirt including dust adheres using the cleaning composition according to any one of [1] to [4].
[6] The cleaning method according to [5], wherein the article is at least one selected from the group consisting of textile products, medical instruments, electrical equipment, precision instruments, and optical articles.

The cleaning composition of the present invention is excellent in removing (meth)acrylic resin and dust from articles.
Moreover, according to the present invention, a cleaning method using the cleaning composition can be provided.

The terms used in the present invention have the following meanings.
(Meth)acrylic resin is a general term for acrylic resin and methacrylic resin.

Dirt includes (meth)acrylic resin and dust. The dirt may consist of (meth)acrylic resin and dust, or may contain components other than (meth)acrylic resin and dust. The dust includes organic matter, inorganic matter, or a composite of both.
Examples of organic substances include oils such as processed oil, fluorine oil, silicone oil, and synthetic oil; resins such as polycarbonate, polystyrene, polyethylene, polypropylene, and polytetrafluoroethylene (hereinafter also referred to as PTFE); and organic fibers. etc. Two or more kinds of organic matter may be included.
Examples of inorganic substances include silica, calcium, iron chloride, glass, inorganic fibers, graphite, and metals. Two or more inorganic substances may be included.
Examples of composite materials include composite materials of the above-described organic matter and inorganic matter.
Dirt may be liquid or solid. The shape of the solid dirt is not particularly limited, and may be spherical, elliptical, cubic, spindle-shaped, or amorphous.
In the case of solid spherical dirt, the size of the dirt is not particularly limited, but is, for example, about 0.1 μm to 1 mm, preferably about 1 μm to 0.1 mm.

(Cleanser composition)
The solvent composition of the present invention comprises 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (hereinafter also referred to as HFE-347pc-f), 2-chloro-1, 1,1-trifluoroethane (CF ₃ CH ₂ Cl, hereinafter also referred to as HCFC-133a).

(HFE-347pc-f)
HFE-347pc-f has zero ozone depletion potential and low global warming potential.
HFE-347pc-f has no flash point.
HFE-347pc-f has low surface tension and viscosity.
HFE-347pc-f has a boiling point of 56°C.

HFE-347pc-f is, for example, a method of reacting 2,2,2-trifluoroethanol and tetrafluoroethylene in the presence of an aprotic polar solvent and a catalyst (alkoxide or alkali metal hydroxide). (see WO2004/108644).

Commercially available products of HFE-347pc-f include, for example, the following.
"Asahiklin (registered trademark) AE-3000" (manufactured by AGC).

(HCFC-133a)
HCFC-133a has a boiling point of 6°C.
HCFC-133a can be produced, for example, by supplying trichlorethylene and hydrogen fluoride in the presence of a catalyst (chromium oxide) and reacting them in the gas phase.

The cleaning composition of the present invention contains HFE-347pc-f and HCFC-133a, thereby improving the detergency of the cleaning composition and removing stains including (meth)acrylic resin and dust on articles. Excellent in sex.

The content of HFE-347pc-f in the cleaning composition of the present invention is the same as that of HFE-347pc-f and HCFC-133a in terms of excellent removability of stains including (meth)acrylic resin and dust on articles. is preferably 99.9900 to 99.9999% by mass, more preferably 99.9950 to 99.9999% by mass, and even more preferably 99.9975 to 99.9999% by mass, based on the total content of

The content of HCFC-133a in the cleaning composition of the present invention is the total of HFE-347pc-f and HCFC-133a in terms of excellent removability of stains including (meth)acrylic resin and dust on articles. The content is preferably 1 to 100 ppm by mass, more preferably 1 to 50 ppm by mass, and even more preferably 1 to 25 ppm by mass.

The total content of HFE-347pc-f and HCFC-133a in the detergent composition of the present invention is the same as the total content of It is preferably 80 to 100% by mass, more preferably 90 to 100% by mass, and even more preferably 95 to 100% by mass, relative to the total amount of the product.

From the viewpoint of imparting antifouling properties to articles, the detergent composition of the present invention further contains tetrafluoroethylene (hereinafter also referred to as TFE) and 1,1,2-trifluoro-2-(2,2, It preferably contains at least one selected from the group consisting of 2-trifluoroethoxy)ethene (C ₄ H ₂ F ₆ O, hereinafter also referred to as specific vinyl ether). Here, the antifouling property means to prevent adhesion of stains such as resin materials, dust, adhesives, inks, inorganic components, organic components, etc. to the article surface. At this time, the antifouling property is evaluated by the contact angle of the article surface. The contact angle is the angle between the liquid surface and the surface of the article where the stationary liquid contacts the surface of the article. The larger this angle, the higher the antifouling property of the article. The change in contact angle before and after washing is preferably 3° or more, more preferably 8° or more.

The specific vinyl ether can be obtained, for example, by reacting 2,2,2-trifluoroethanol with hexafluoropropylene oxide in the presence of an aqueous potassium hydroxide solution, diethyl ether and tetra-n-butylammonium bromide to give 2-(2, After obtaining 2,2-trifluoroethoxy)tetrafluoropropionic acid, 2-(2,2,2-trifluoroethoxy)tetrafluoropropionic acid is reacted with sodium hydroxide in the presence of methanol to give 2 After obtaining -(2,2,2-trifluoroethoxy)sodium tetrafluoropropionate, sodium 2-(2,2,2-trifluoroethoxy)tetrafluoropropionate is reacted by heating to obtain 1, It can be produced by a method for obtaining 1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene.

When the cleaning composition of the present invention contains TFE, the contact angle on the surface of the article is improved and the article is endowed with antifouling properties. The total content of 347pc-f, HCFC-133a and TFE is preferably 0.1 to 100 mass ppm, more preferably 0.2 to 80 mass ppm, and even more preferably 0.5 to 75 mass ppm.

When the cleaning composition of the present invention contains TFE, the content of HCFC-133a in the cleaning composition of the present invention is 1 to 100 mass ppm is preferred, 1 to 50 mass ppm is more preferred, and 1 to 25 mass ppm is even more preferred.

When the cleaning composition of the present invention contains TFE, the content of HFE-347pc-f in the cleaning composition of the present invention is , preferably 99.98000 to 99.99989% by mass, more preferably 99.98700 to 99.99988% by mass, and even more preferably 99.99000 to 99.99985% by mass.

When the cleaning composition of the present invention contains TFE, HFE-347pc-f, The total content of HCFC-133a and TFE is preferably 80-100% by mass, more preferably 90-100% by mass, and even more preferably 95-100% by mass, based on the total amount of the cleaning composition.

When the cleaning composition of the present invention contains a specific vinyl ether, the contact angle on the surface of the article is improved and the article is imparted with antifouling properties. Therefore, the content of the specific vinyl ether in the cleaning composition of the present invention is The total content of HFE-347pc-f, HCFC-133a and specific vinyl ether is preferably 1 to 1000 ppm by mass, more preferably 5 to 750 ppm by mass, and even more preferably 10 to 500 ppm by mass.

When the cleaning composition of the present invention contains a specific vinyl ether, the content of HCFC-133a in the cleaning composition of the present invention is 1 to 100 ppm by mass is preferable, 1 to 50 ppm by mass is more preferable, and 1 to 25 ppm by mass is more preferable.

When the cleaning composition of the present invention contains a specific vinyl ether, the content of HFE-347pc-f in the cleaning composition of the present invention is the total content of HFE-347pc-f, HCFC-133a and the specific vinyl ether. is preferably 99.8900 to 99.9998% by mass, more preferably 99.9200 to 99.9994% by mass, and even more preferably 99.9475 to 99.9989% by mass.

When the cleaning composition of the present invention contains a specific vinyl ether, HFE-347pc-f in the cleaning composition of the present invention is excellent in removing stains including (meth)acrylic resin and dust on articles. , HCFC-133a and the specific vinyl ether is preferably 80 to 100% by mass, more preferably 90 to 100% by mass, and still more preferably 95 to 100% by mass, based on the total amount of the cleaning composition.

The detergent composition of the present invention contains components other than HFE-347pc-f, HCFC-133a, TFE and specific vinyl ether (hereinafter also referred to as component (A)) within a range that does not impair the effects of the present invention. You can

(Component (A))
Component (A) is a component soluble in HFE-347pc-f and HCFC-133a, and when the detergent composition of the present invention contains TFE and specific vinyl ether, a component soluble in TFE and specific vinyl ether. is.
Component (A) is appropriately selected according to various purposes such as enhancing solubility and adjusting volatilization speed.
Component (A) includes hydrocarbons soluble in HFE-347pc-f, HCFC-133a, TFE and specific vinyl ethers, ethers other than specific vinyl ethers, alcohols, ketones, esters, amines, chlorocarbons, hydrofluorocarbons (hereinafter , also referred to as HFC), perfluorocarbons other than TFE (hereinafter also referred to as PFC), and hydrochlorofluorocarbons other than HCFC-133a (hereinafter also referred to as HCFC). These components may be contained singly or in combination of two or more.

The hydrocarbon may be linear, cyclic, saturated, or unsaturated.
Hydrocarbons include heptane, hexane, heptane, octane, nonane, cyclobutane, cyclopentane, cyclohexane, 1-butene, 2-butene, 2-methylpropene, 1-pentene, 2-pentene, 1-butyne, and 2-butyne. , pentyne, cyclopropene, cyclobutene, cyclopentene, cyclohexene are preferred.

The alcohol may be linear, cyclic, saturated, or unsaturated.
Preferred alcohols are methanol, ethanol, normal propyl alcohol, isopropyl alcohol, normal butyl alcohol, isobutyl alcohol, sec-butyl alcohol and tert-butyl alcohol.

Ethers other than the specific vinyl ether may be linear or cyclic, saturated ethers, or unsaturated ethers.
Preferred ethers other than the specific vinyl ether are dimethyl ether, ethyl methyl ether, diethyl ether, diisopropyl ether, methyl-tert-butyl ether and tetrafluoroethanol.

The ketone may be linear, cyclic, saturated, or unsaturated.
Preferred ketones are acetone, methyl ethyl ketone, diethyl ketone, methyl propyl ketone, methyl isobutyl ketone, cyclopentanone and cyclohexanone.

The ester may be linear or cyclic, saturated or unsaturated.
Preferred esters are methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl butyrate, ethyl butyrate and γ-butyrolactone.

Preferred amines are monomethylamine, dimethylamine and trimethylamine.

The chlorocarbon may be linear, cyclic, saturated, or unsaturated.
Chlorocarbons include dichloromethane, 1,1-dichloroethane, 1,2-dichloroethane, 1,1,2-trichloroethane, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, pentachloroethane, Chloroethane, 1,1-dichloroethylene, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, trichlorethylene, tetrachlorethylene, 1,2-dichloropropane are preferred.

HFCs include 1,1,1,3,3-pentafluorobutane, 1,1,1,2,2,3,4,5,5,5-decafluoropentane, 1,1,2,2, 3,3,4-heptafluorocyclopentane, 1,1,1,2,2,3,3,4,4-nonafluorohexane, 1,1,1,2,2,3,3,4,4 ,5,5,6,6-tridecafluorohexane and 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorooctane are preferred.

PFCs other than TFE are preferably decafluorobutane, dodecafluoropentane, tetradecafluorohexane, hexadecafluoroheptane, and octadecafluorooctane.

HCFCs other than HCFC-133a include dichloropentafluoropropane, 1,1-dichloro-1-fluoroethane, 1-chloro-1,1-difluoroethane, and 2,2-dichloro-1,1,1-trifluoroethane. is preferred.

When the cleaning composition of the present invention contains component (A), the content thereof is preferably 20% by mass or less, more preferably 10% by mass or less, and 5% by mass, based on the total amount of the cleaning composition. More preferred are:

The cleaning composition of the present invention is preferably used for cleaning articles to which stains containing (meth)acrylic resin and dust adhere.

(Washing method)
The cleaning method of the present invention uses the cleaning agent composition of the present invention to clean the (meth)acrylic resin adhering to articles and stains.
Examples of the mode in which the (meth)acrylic resin adheres to the article include the case where an adhesive containing the (meth)acrylic resin is brought into contact with the article, and the case where the article is coated with an ink containing the (meth)acrylic resin. Specific examples include metal parts, resin parts, ink-jet printer head and nozzle parts, etc., to which acrylic adhesives containing UV curable resins and the like, inks containing dyes and acrylic resins are adhered and adhered.

The cleaning composition of the present invention dissolves and removes the (meth)acrylic resin on the article and also removes stains containing the (meth)acrylic resin and dust.

As a specific cleaning method, the cleaning composition of the present invention may be brought into contact with the surface of an article. Although not particularly limited, for example, hand wiping, immersion, spraying, shaking, ultrasonic waves, steam cleaning, or a combination thereof can be employed.

Materials for articles to which the cleaning composition of the present invention can be applied include metals, resins other than (meth)acrylic resins, elastomers, glass, and ceramics. Also, the article may be made of a composite material containing two or more of these materials. Composite materials include laminates of metals and resins other than (meth)acrylic resins.
Specific examples of articles to which the cleaning method of the present invention can be applied include textile products, medical instruments, electrical equipment, precision machinery, optical equipment, transportation equipment, and parts thereof. Specific examples of electrical equipment, precision machinery, optical equipment, transportation machinery, and their parts include electric wires, fuses, current controllers, transformers, electric heaters, capacitors, resistors such as thermistors, transformers, inductors, switches, and connectors. , acoustic parts such as speakers, sensors such as light and heat, actuators such as motors, power supply parts, crystal oscillators, crystal oscillators, filters, antenna parts, printed circuit boards mounted with these, relays, optical lenses, glass substrates, Bearings, gears, chains and brakes.

The present invention will be described in detail below with reference to examples. The invention is not limited to these examples. Examples 2 to 6 are examples of the detergent composition of the present invention, and Examples 1 and 7 are comparative examples.

(HFE-347pc-f)
AE-3000 (manufactured by AGC) was purchased as HFE-347pc-f.

(Preparation of HCFC-133a)
A U-shaped reaction tube made of Inconel 600 having an inner diameter of 1/2 inch and a length of 100 cm was filled with a chromium oxide catalyst (50 mL) and heated to 300° C. while flowing nitrogen gas (150 NmL/min). While maintaining the inside of the reaction tube at atmospheric pressure, the catalyst was dried until the water content in the crude gas after passing through the reaction tube was 20 ppm by volume or less. After drying the catalyst, the catalyst was activated by fluorination at 300° C. while flowing a mixed gas of hydrogen fluoride (68.3 NmL/min) and nitrogen (34.1 NmL/min). The reaction tube was heated to 250° C., and gasified trichlorethylene (9.30 NmL/min) and hydrogen fluoride (93.1 NmL/min) were supplied and reacted. The reaction crude gas was passed through a 10% by mass potassium hydroxide aqueous solution. After 30 hours, the separated organic layer was collected in a 10% by mass potassium hydroxide aqueous solution. As a result of purifying the recovered organic layer by distillation, HCFC-133a (31.0 g) with a purity of 100% by mass was obtained.

(Preparation of specific vinyl ether)
Into a 2 L stainless steel reaction vessel equipped with a stirrer and lined with fluorine resin, 35% by mass aqueous potassium hydroxide solution (480 g), diethyl ether (400 mL), tetra-n-butylammonium bromide (12. 2g) was added and stirring was started. To this, 2,2,2-trifluoroethanol (161 g) was gradually added dropwise while cooling in an ice bath so as not to raise the temperature of the reaction vessel. After the dropwise addition was complete, hexafluoropropylene oxide (133 g) was introduced with stirring to maintain the temperature of the reaction vessel below 30°C. After stirring for 1 hour, 35% hydrochloric acid was added until pH=1. After stirring for an additional hour, the organic layer separated into the aqueous layer and was collected. As a result of purifying the recovered organic layer by distillation, 2-(2,2,2-trifluoroethoxy)tetrafluoropropionic acid (148 g) with a purity of 100% by mass was obtained.
Methanol (100 g) and sodium hydroxide pellets (26.8 g) were put into a 1-liter glass reactor equipped with a stirrer, and stirring was started. A mixed solution of 2-(2,2,2-trifluoroethoxy)tetrafluoropropionic acid (148 g) and methanol (100 g) was slowly added dropwise to this while cooling in an ice bath so as not to raise the temperature of the reaction vessel. . After completion of the dropwise addition, methanol was distilled off under a reduced pressure of 2 to 3 torr while heating the reaction vessel to 60° C., and then methanol was distilled off from the residue under a reduced pressure of 2 to 3 torr while heating the reaction vessel to 100° C. Stripping gave a residue. Thereafter, the reaction vessel was heated to 250° C., and the resulting volatile substances were collected in a −78° C. cooling trap and the condensate was purified by distillation, resulting in 1,1,2-trifluoro-2 with a purity of 100% by mass. -(2,2,2-trifluoroethoxy)ethene (73.2 g) was obtained.

(Preparation of TFE)
Zinc powder (164 g), zinc chloride (10 g), ethanol (500 g), dibromotetrafluoroethane (649 g), tetra-n-butylammonium bromide (10 g) were placed in a 2 L Hastelloy reaction vessel equipped with a stirrer. was added and stirring was started. The reactor was stirred for 3 hours while being heated at 65° C., and the generated gas was collected in a stainless steel container cooled to −78° C. to obtain TFE (160 g) with a purity of 100% by mass.

(Preparation of nonafluorobutoxymethane)
Nonafluorobutoxymethane ( _hereinafter also referred to as "HFE-449s1") means _a compound represented by _C4F9OCH3 . As HFE-449s1, 1-methoxy-2-trifluoromethyl-1,1,2,3,3,3-hexafluoropropane and 1-methoxy-1,1,2,2,3,3,4,4 ,4-nonafluorobutane and "Novec 7100" (manufactured by 3M) was purchased.

(Preparation of detergent composition)
HFE-347pc-f, HCFC-133a, 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene, TFE, and HFE-449s1 were adjusted to have the mass ratio shown in Table 1. were mixed to prepare detergent compositions of Examples 1 to 7.

(Preparation of test piece)
An acrylic resin solution was prepared by adding 1.737 g of acrylic resin to 10 g of trichlorethylene and stirring and dissolving the mixture.
A cleaned 50 mm×50 mm glass substrate was used for the test. The contact angle of water on the glass substrate was 8°.
1 g of the prepared acrylic resin solution was applied to one side of a glass substrate, and graphite powder (reagent special grade, Fujifilm Wako Pure Chemical Industries, Ltd.) and PTFE powder (reagent, Fujifilm Wako Pure Chemical Industries, Ltd.) were used as dust. was sprinkled on the surface and dried overnight to prepare a test piece, and the total mass (stain amount) of the acrylic resin, graphite powder, and PTFE powder applied was determined from the difference in mass before and after application.

(Evaluation of cleaning test and residual particles)
This example was tested using two 1 L beakers. 800 ml of the detergent compositions of Examples 1 to 7 were placed in a 1 L beaker and placed in a water bath of an ultrasonic cleaner (Sharp ultrasonic cleaner UH-206H, 35 kHz, output 200 W) at 45°C. 300 ml of the detergent compositions of Examples 1 to 7 were placed in a 1 L beaker fitted with a cooling tube at the top, and the 1 L beaker was placed on a hot plate and heated to generate solvent vapor. In this example, one prepared test piece was used, and ultrasonic immersion cleaning was performed for 3 minutes and steam cleaning was performed for 3 minutes in this test device. Hylox Co., Ltd.) was used to evaluate the surface acrylic resin and particle residual state before and after the test by visual observation. The cleaning rate, and acrylic resin and particle residue were evaluated according to the following criteria.
In addition, the following cleaning rates are calculated by the following formulas. The higher the cleaning rate below, the higher the removability of the (meth)acrylic resin, the graphite powder, and the PTFE powder.
Cleaning rate (%) = 100 - (mass of test piece before cleaning - mass of test piece after cleaning) / (mass of test piece before cleaning - mass of test piece before preparation) x 100
Cleaning rate rating:
A: more than 70%, B: 50% or more and 70% or less, C: less than 50%
Detergency evaluation by appearance of acrylic resin and particles:
AA: Remaining acrylic resin and particles cannot be (almost) confirmed, A: Acrylic resin and particles are greatly reduced, B: Acrylic resin and particles are reduced but often observed, C: No difference from the initial stage.

(Measurement of contact angle of water on glass substrate)
A cleaning test was performed in the same manner using only the glass test piece, and the contact angle of water on the glass substrate before and after the test was measured with an automatic contact angle meter (DY-300 manufactured by Kyowa Interface Science). The contact angle of water before and after the test (contact angle after test - contact angle before test) was evaluated according to the following criteria.
Contact angle (change from initial value)
A: 8° or more, B: 3° or more and less than 8°, C: less than 3°

In Table 1, the "HEF-347pc-f (% by mass)" column of Examples 1 to 4 shows the content of HEF-347pc-f (% by mass) with respect to the total content of HFE-347pc-f and HCFC-133a ).
In Table 1, the "HCFC-133a (mass ppm)" column of Examples 1 to 4 represents the content of HCFC-133a (mass ppm) with respect to the total content of HFE-347pc-f and HCFC-133a.
In Table 1, the "HEF-347pc-f (% by mass)" column of Example 5 shows the content of HEF-347pc-f (weight %).
In Table 1, the "HCFC-133a (mass ppm)" column of Example 5 represents the content of HCFC-133a (mass ppm) with respect to the total content of HFE-347pc-f, HCFC-133a and specific vinyl ether. .
In Table 1, the "specific vinyl ether (mass ppm)" column of Example 5 represents the content (mass ppm) of the specific vinyl ether with respect to the total content of HFE-347pc-f, HCFC-133a and the specific vinyl ether.
In Table 1, the "HEF-347pc-f (% by mass)" column of Example 6 shows the content of HEF-347pc-f (% by mass) with respect to the total content of HFE-347pc-f, HCFC-133a and TFE ).
In Table 1, the "HCFC-133a (mass ppm)" column of Example 6 represents the content (mass ppm) of HCFC-133a with respect to the total content of HFE-347pc-f, HCFC-133a and TFE.
In Table 1, the "TFE (mass ppm)" column of Example 6 represents the TFE content (mass ppm) with respect to the total content of HFE-347pc-f, HCFC-133a and TFE.
In Table 1, the "HFE-449s1 (% by mass)" column represents the content (% by mass) of HFE-449s1 with respect to the total amount of the cleaning composition.

Examples 2 to 6, in which the cleaning agent composition contains HFE-347pc-f and HCFC-133a, are AA or A in terms of cleaning rate and appearance, and are excellent in removability of (meth)acrylic resin on articles. It is also excellent in removing dirt particles coexisting with (meth)acrylic resin.
Examples 5 and 6, in which the detergent composition further contains TFE and a specific vinyl ether, have a contact angle of A and improved antifouling properties after washing.

Claims (6)

A detergent composition comprising 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and 2-chloro-1,1,1-trifluoroethane. The total content of the 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and the 2-chloro-1,1,1-trifluoroethane is the cleaning composition. The cleaning composition according to claim 1, which is 80 to 100% by mass based on the total amount of the product. The cleaning according to claim 1 or 2, further comprising at least one selected from the group consisting of tetrafluoroethylene and 1,1,2-trifluoro-2-(2,2,2-trifluoroethoxy)ethene. agent composition. 4. The cleaning composition according to any one of claims 1 to 3, which is used for cleaning articles to which dirt containing (meth)acrylic resin and dust adheres. A cleaning method, comprising cleaning an article to which dirt containing (meth)acrylic resin and dust adheres using the cleaning composition according to any one of claims 1 to 4. The cleaning method according to claim 5, wherein the article is at least one selected from the group consisting of textile products, medical instruments, electrical equipment, precision instruments, and optical articles.